CN101586210A - High strength enamel steel and producing technology and enamel firing technology thereof - Google Patents
High strength enamel steel and producing technology and enamel firing technology thereof Download PDFInfo
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- CN101586210A CN101586210A CNA2009100626673A CN200910062667A CN101586210A CN 101586210 A CN101586210 A CN 101586210A CN A2009100626673 A CNA2009100626673 A CN A2009100626673A CN 200910062667 A CN200910062667 A CN 200910062667A CN 101586210 A CN101586210 A CN 101586210A
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Abstract
The invention discloses a high strength enamel steel in which the chemical compositions are as follows according to weight percentages: C is 0.01 to 0.12; Si is less than or equal to 0.03, Mn is 0.50 to 1.00, P is less than or equal to 0.070, S is less than or equal to 0.015, Nb is 0.020 to 0.050, Mo is 0.05 to 0.30, Als is 0.005 to 0.070, and the remainder is Fe and unavoidable impurities; simultaneously, the steel further meets that 10Nb is greater than or equal to Mo and 10Nb+Mo is greater than or equal to 0.30 and is less than or equal to 0.50. The steel yield strength is greater than or equal to 360 MPa. The production and enamel firing technology of the steel in turn comprises melted iron desulfurization, combined converting at converting top and bottom, argon blowing treatment, protective casting into plate blank, controlled rolling controlled cold rolling into hot rolled plate, acid cleaning, sand blasting, enamelling and high temperature enamel firing, having simple production working procedures, low production cost, multiple enamelling methods, good enamel adhesiveness and high-temperature resistant enamel firing.
Description
Technical field
The present invention relates to the manufacturing technology of micro-alloyed hot rolled steel plate and steel band, refer to that particularly a kind of high strength enamel wards off technology with steel and production thereof and burning.
Background technology
Enamel has purposes widely with steel.In order to guarantee its cold formability and enamel property, carbon (C) content is generally below 0.01% with steel for early stage enamel, hardly carbon containing.In its production technique, need to add expensive microalloy element, handle through also carrying out decarburizing annealing after hot rolling, the cold-rolling treatment, the enamel of being produced with steel not only intensity low (general yield strength≤200MPa), production process is many, the production cycle is long, production cost is high, and owing to need annealed thermal treatment, plate surface quality is relatively poor, bubbles easily in the follow-up enameling process, and is easy to generate defective such as stain.
For the better enamel steel of obtained performance, before the present patent application, ZL90102120.2 Chinese invention patent specification sheets discloses a kind of " enamel sheet and manufacture method thereof ", ZL00801729.8 Chinese invention patent specification sheets discloses a kind ofly " has good formability, resistance to blistering, adhering continuous casting enamel sheet of anti-stain and vitreous enamel and manufacture method thereof ", ZL01802486.6 Chinese invention patent specification sheets discloses a kind of " processibility, ageing and outstanding enamel sheet and the manufacture method of glazing ", but the employing hot rolling+cold rolling+annealed method of being put down in writing in the above-mentioned patent specification that remains is produced the enamel steel, the temperature that its burning is warded off is generally below 850 ℃, soaking time only is 3min, and the early stage enamel of the solution not yet in effect existing a series of defectives of steel.And its application of slip method is single, and the limitation of practical application is very big.Conclusion is got up, and existing enamel is lower with the intensity of steel, and the enamel adhesion property is relatively poor, and high temperature resistant enamel firing performance deficiency makes its application be subjected to very big restriction.
Summary of the invention
Purpose of the present invention is exactly will provide that a kind of production process is simple, production cost is low, the enamel tack is good and the high strength enamel of high temperature resistant enamel firing is warded off technology with steel and production thereof and burning.
For achieving the above object, the high strength enamel steel that the present invention is designed, its chemical ingredients percentage ratio is by weight counted:
C:0.01～0.12, Si≤0.03, Mn:0.50～1.00, P≤0.070, S≤0.015, Nb:0.020～0.050, Mo:0.05～0.30, Als:0.005～0.070, surplus are Fe and unavoidable impurities; This steel also satisfies 10Nb 〉=Mo, 0.30≤10Nb+Mo≤0.50 simultaneously.
Above-mentioned high strength enamel is warded off technology with the production and the burning of steel; comprise successively that desulfurizing iron, converter top bottom blowing, Argon are handled, protection is cast into slab, controlled rolling and controlled cooling rolls into hot-rolled sheet, pickling, sandblast, the application of slip, high temperature burn the step of warding off, and makes the Chemical Composition of steel satisfy above-mentioned requirements.Described controlled rolling and controlled cooling rolls in the hot-rolled sheet step: earlier slab is heated to 1180 ℃～1220 ℃, every time draft of roughing is 25%～35%, and the accumulative total draft is 75%～90%, and the roughing end temp is 1060 ℃～1120 ℃; Finish rolling again, finish rolling start rolling temperature are 910 ℃～960 ℃, and the pony-roughing pass draft is 18%～30%, and last two passage drafts are 12%～20%, and finishing temperature is 800 ℃～860 ℃; Roll the back and adopt the laminar flow cooling, speed of cooling is 15 ℃/s～35 ℃/s, and coiling temperature is 580 ℃～660 ℃, makes the hot-rolled sheet that thickness of slab is 1mm～3.5mm; Described high temperature burns to be warded off in the step, and it is 850 ℃～900 ℃ that burning is warded off temperature.
Further, in the described application of slip step: adopt electrostatic spraying enamel dry powder or wet dip-coating to ward off the two-sided or single face application of slip of method.Diversified application of slip mode can make the scope of border application in fact greatly expand.
Further, described high temperature burns to be warded off in the step, and it is 870 ℃～880 ℃ that burning is warded off temperature, and soaking time is 4min/mm * h, and wherein h is a slab thickness, and unit is mm.Can guarantee the intensity of product like this, and obtain fabulous enamel adhesion property.
The invention has the advantages that: compare with the manufacturing process of steel with existing enamel, the present invention is not owing to carry out the decarburizing annealing processing, and it is simple that production process becomes; Because the expensive microalloy element that adds is less, production cost reduces; Application of slip method is not limited to, and can adopt several different methods directly in the application of slip of surface of steel plate single or double, the enameling process simple economy, and have good enamel tack, high thermal resistance and high temperature resistant enamel firing.Handle owing to not carrying out decarburizing annealing equally, obtained product strength height, its yield strength 〉=360MPa, tensile strength (Rm) 〉=450MPa, unit elongation (A) 〉=22% can be widely used in making tableware, sanitary ware, household electrical appliances etc.
Embodiment
The present invention is described in further detail below in conjunction with specific embodiment:
The high strength enamel steel that the embodiment of the invention provides, its chemical ingredients percentage ratio is by weight counted: C:0.01～0.12, Si≤0.03, Mn:0.50～1.00, P≤0.070, S≤0.015, Nb (niobium): 0.020～0.050, Mo (molybdenum): 0.05～0.30, Als (sour molten aluminium): 0.005～0.070, and surplus is Fe and unavoidable impurities; This steel also satisfies 10Nb 〉=Mo, 0.30≤10Nb+Mo≤0.50 simultaneously.
Table 1: the chemical ingredients of steel of the present invention (wt%)
| Composition | C | Si | Mn | P | S | Nb | Mo | Als |
| 1 | 0.038 | 0.022 | 0.66 | 0.040 | 0.006 | 0.028 | 0.09 | 0.012 |
| 2 | 0.070 | 0.026 | 0.82 | 0.056 | 0.005 | 0.035 | 0.15 | 0.042 |
| 3 | 0.110 | 0.025 | 0.91 | 0.068 | 0.007 | 0.027 | 0.22 | 0.061 |
Above-mentioned high strength enamel is warded off technology with the production and the burning of steel; comprise successively that desulfurizing iron, converter top bottom blowing, Argon are handled, protection is cast into slab, controlled rolling and controlled cooling rolls into hot-rolled sheet, pickling, sandblast, the application of slip, high temperature burn the step of warding off, each step is described in detail as follows:
1. adopt the dark desulfurization technology of molten iron, make S≤0.005% in the molten iron.
2. on steelwork converter (capacity 〉=80 ton), carry out top bottom blowing, add ferrocolumbium when the converter top bottom blowing finishes, guarantee the abundant fusion of ferro-niobium in steel.
3. Argon was handled 5～10 minutes.After molten steel is handled through Argon, Chemical Composition in the steel satisfies following requirement: the percentage ratio meter contains C:0.01～0.12, Si≤0.03, Mn:0.50～1.00, P≤0.070, S≤0.015, Nb:0.020～0.050, Mo:0.05～0.30, Als:0.005～0.070 by weight, and surplus is Fe and unavoidable impurities; This steel chemical composition also satisfies 10Nb 〉=Mo, 0.30≤10Nb+Mo≤0.50 by weight simultaneously, with the requirement of the high temperature resistant enamel firing that satisfies steel.
4. the pouring molten steel that meets the demands is become the slab of (200～300) mm * 1550mm section.Smelting molten steel is whole process using protection casting in casting cycle, prevents to increase Si in the casting cycle, and molten steel casting is become slab.
5. above-mentioned slab is delivered to hot continuous rolling factory, the hot continuous rolling production technique that adopts controlled rolling and controlled cooling to handle is rolled into hot-rolled sheet with it.When adopting the hot continuous rolling production technique of controlled rolling and controlled cooling processing,, preferably utilize the capacity of equipment of high-power milling train, reduce rolling pass, improve percentage pass reduction for giving full play to the effect of microalloy element in steel.Earlier slab is heated to 1180 ℃～1220 ℃, every time draft of roughing is 25%～35%, and the accumulative total draft is 75%～90%, makes it austenite crystal and refine to below the 14 μ m, and the roughing end temp is 1060 ℃～1120 ℃.The water spray controlled temperature carries out finish rolling again after the roughing, and the finish rolling start rolling temperature is 910 ℃～960 ℃, and the pony-roughing pass draft is 18%～30%, and last two passage drafts are 12%～20%, and finishing temperature is 800 ℃～860 ℃.Roll the back and adopt the laminar flow cooling, speed of cooling is 15 ℃/s～35 ℃/s.Batch at last, coiling temperature is 580 ℃～660 ℃, guarantees that austenite crystal refine to below the 8 μ m, makes the hot-rolled sheet that thickness of slab is 1mm～3.5mm by this method.
6. iron scale is removed in the hot-rolled sheet pickling on specific equipment that makes.
7. carrying out surface sand-blasting handles.
8. the method that adopts electrostatic spraying enamel dry powder or wet dip-coating to ward off is directly in the two-sided of slab or the single face application of slip.
9. control is burnt and to be warded off temperature 870 ℃～880 ℃ scope, preferably is stabilized in 870 ℃, and soaking time is controlled to be 4min/mm * h, and wherein h is slab thickness (mm), carries out high temperature and burns and ward off the product that can obtain to meet the demands.
After testing, the processing parameter of the high strength enamel usefulness steel that makes as stated above and test-results are referring to following table 2, table 3 and table 4, enumerate the hot-rolled high-strength enamel steel of three kinds of compositions of upper, middle and lower limit in the table, corresponded respectively to the composition 1,2,3 in each table.The hot-rolled sheet explained hereafter is pressed in test, two kinds of thicker and thin specifications that wherein every kind of technology of upper and lower limit composition is rolling.From the performance that table 3 and table 4 reflect, each composition 1mm～3.5mm hot-rolled steel sheet can both satisfy yield strength 〉=360MPa, tensile strength (Rm) 〉=450MPa, the requirement of unit elongation (A) 〉=22%.After the two-sided application of slip of this surface of steel plate, place phenomenons such as no squama is quick-fried more than the week, enamel comes off, tack is bad naturally, the enamel qualification rate is 100%.Be to carry out high temperature under the condition of 4min/mm * h (wherein h is a slab thickness, and unit is mm) to burn and ward off 870 ℃ temperature, soaking time with the steel plate after the application of slip, detect mechanical property rate of descent≤25% of finding steel plate, the microstructure grain fineness number descends≤2 grades.
Table 2: steel hot-rolling plate preparation method of the present invention and test-results
Annotate: composition 1,2,3 in the table 2 and the composition 1,2,3 in the table 1 are corresponding relation.
Table 3: steel cold test result of the present invention
| Grade of steel | Thickness/mm | Yield strength/MPa | Tensile strength/MPa | Unit elongation/% | Ferrite grain size | Electrostatic dry powder spraying enamel (two-sided) | (two-sided) warded off in wet dip-coating |
| 1 | 1.5 | 390 | 465 | 32 | 12.5 | Without phosphorus quick-fried, leak ward off, the enamel obscission, intact. | Without phosphorus quick-fried, leak ward off, the enamel obscission, intact. |
| 2 | 3.5 | 385 | 455 | 30 | 13 | Without phosphorus quick-fried, leak ward off, the enamel obscission, intact. | Without phosphorus quick-fried, leak ward off, the enamel obscission, intact. |
| 3 | 2.0 | 415 | 495 | 27 | 11.5 | Without phosphorus quick-fried, leak ward off, the enamel obscission, intact. | Without phosphorus quick-fried, leak ward off, the enamel obscission, intact. |
| 4 | 1.5 | 445 | 540 | 29 | 12 | Without phosphorus quick-fried, leak ward off, the enamel obscission, intact. | Without phosphorus quick-fried, leak ward off, the enamel obscission, intact. |
| 5 | 3.5 | 440 | 525 | 27 | 12.5 | Without phosphorus quick-fried, leak ward off, the enamel obscission, intact. | Without phosphorus quick-fried, leak ward off, the enamel obscission, intact. |
Annotate: grade of steel 1,2,3,4,5 in the table 3 and the grade of steel 1,2,3,4,5 in the table 2 are corresponding relation.
Table 4: steel high temperature of the present invention burns wards off the back test-results
| Grade of steel | Thickness/mm | Burning is warded off technology (temperature * time) | Yield strength/MPa | Tensile strength/MPa | Unit elongation/% | The mechanical property rate of descent | Ferrite grain size | The grain fineness number rate of descent |
| 1 | 1.5 | 870℃×6min | 310 | 385 | 35 | ＜25％ | 12 | ＜2 grades |
| 2 | 3.5 | 870℃×14min | 300 | 370 | 36 | ＜25％ | 12 | ＜2 grades |
| 3 | 2.0 | 870℃×8min | 325 | 400 | 32 | ＜25％ | 11.5 | ＜2 grades |
| 4 | 1.5 | 870℃×6min | 360 | 455 | 37 | ＜25％ | 11.5 | ＜2 grades |
| 5 | 3.5 | 870℃×14min | 350 | 430 | 34 | ＜25％ | 12 | ＜2 grades |
Annotate: the grade of steel 1,2,3,4,5 in grade of steel 1,2,3,4,5 in the table 4 and table 2, the table 3 is a corresponding relation.
Claims (4)
1. high strength enamel steel, it is characterized in that: the chemical ingredients of this steel percentage ratio is by weight counted: C:0.01～0.12, Si≤0.03, Mn:0.50～1.00, P≤0.070, S≤0.015, Nb:0.020～0.050, Mo:0.05～0.30, Als:0.005～0.070, surplus are Fe and unavoidable impurities; This steel also satisfies 10Nb 〉=Mo, 0.30≤10Nb+Mo≤0.50 simultaneously.
2. the described high strength enamel of claim 1 is warded off technology with the production and the burning of steel, comprise successively that desulfurizing iron, converter top bottom blowing, Argon are handled, protection is cast into slab, controlled rolling and controlled cooling rolls into hot-rolled sheet, pickling, sandblast, the application of slip, high temperature burn the step of warding off, it is characterized in that: described controlled rolling and controlled cooling rolls in the hot-rolled sheet step: earlier slab is heated to 1180 ℃～1220 ℃, every time draft of roughing is 25%～35%, the accumulative total draft is 75%～90%, and the roughing end temp is 1060 ℃～1120 ℃; Finish rolling again, finish rolling start rolling temperature are 910 ℃～960 ℃, and the pony-roughing pass draft is 18%～30%, and last two passage drafts are 12%～20%, and finishing temperature is 800 ℃～860 ℃; Roll the back and adopt the laminar flow cooling, speed of cooling is 15 ℃/s～35 ℃/s, and coiling temperature is 580 ℃～660 ℃, makes the hot-rolled sheet that thickness of slab is 1mm～3.5mm; Described high temperature burns to be warded off in the step, and it is 850 ℃～900 ℃ that burning is warded off temperature.
3. ward off technology according to the described high strength enamel of claim 2 with the production and the burning of steel, it is characterized in that: in the described application of slip step: adopt electrostatic spraying enamel dry powder or wet dip-coating to ward off the two-sided or single face application of slip of method.
4. ward off technology according to claim 2 or 3 described high strength enamel with the production and the burning of steel, it is characterized in that: described high temperature burns to be warded off in the step, and it is 870 ℃～880 ℃ that burning is warded off temperature, and soaking time is 4min/mm * h, and wherein h is a slab thickness, and unit is mm.
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| CN2009100626673A CN101586210B (en) | 2009-06-16 | 2009-06-16 | High strength enamel steel and producing technology and enamel firing technology thereof |
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| CN2009100626673A CN101586210B (en) | 2009-06-16 | 2009-06-16 | High strength enamel steel and producing technology and enamel firing technology thereof |
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| CN101586210B CN101586210B (en) | 2011-07-20 |
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| CN102188945A (en) * | 2011-04-21 | 2011-09-21 | 上海新花化工设备有限公司 | Mesoporous tank cover for glass-lined reaction tank and production method of mesoporous tank cover |
| CN102747295A (en) * | 2012-07-27 | 2012-10-24 | 武汉钢铁(集团)公司 | Bainite sheet steel produced by controlled rolling and cooling method and preparation method thereof |
| CN106000727A (en) * | 2016-07-27 | 2016-10-12 | 昆山美邦环境科技股份有限公司 | Enameled sheet surface pattern decorative electromagnetic leveling worktable and method for leveling by means of same |
| CN107574375A (en) * | 2017-08-31 | 2018-01-12 | 武汉钢铁有限公司 | Counterenamel hot rolling acid-cleaning steel plate and its manufacture method with excellent application of slip performance |
| CN107779762A (en) * | 2016-08-30 | 2018-03-09 | 宝山钢铁股份有限公司 | A kind of enamel steel plate and its manufacture method with excellent high temperature deformation performance |
| CN107794460A (en) * | 2016-08-30 | 2018-03-13 | 宝山钢铁股份有限公司 | A kind of enamel high-strength steel sheet and its manufacture method with excellent two-sided application of slip performance |
| WO2019076717A1 (en) * | 2017-10-16 | 2019-04-25 | Thyssenkrupp Steel Europe Ag | Enamelling of high-strength steels |
| CN113025907A (en) * | 2021-03-09 | 2021-06-25 | 马鞍山钢铁股份有限公司 | Cold-rolled enameled steel plate for anti-pressing and anti-explosion porcelain water heater liner and production method thereof |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102188945A (en) * | 2011-04-21 | 2011-09-21 | 上海新花化工设备有限公司 | Mesoporous tank cover for glass-lined reaction tank and production method of mesoporous tank cover |
| CN102747295A (en) * | 2012-07-27 | 2012-10-24 | 武汉钢铁(集团)公司 | Bainite sheet steel produced by controlled rolling and cooling method and preparation method thereof |
| CN102747295B (en) * | 2012-07-27 | 2014-06-18 | 武汉钢铁(集团)公司 | Bainite sheet steel produced by controlled rolling and cooling method and preparation method thereof |
| CN106000727A (en) * | 2016-07-27 | 2016-10-12 | 昆山美邦环境科技股份有限公司 | Enameled sheet surface pattern decorative electromagnetic leveling worktable and method for leveling by means of same |
| CN107779762A (en) * | 2016-08-30 | 2018-03-09 | 宝山钢铁股份有限公司 | A kind of enamel steel plate and its manufacture method with excellent high temperature deformation performance |
| CN107794460A (en) * | 2016-08-30 | 2018-03-13 | 宝山钢铁股份有限公司 | A kind of enamel high-strength steel sheet and its manufacture method with excellent two-sided application of slip performance |
| CN107779762B (en) * | 2016-08-30 | 2019-07-23 | 宝山钢铁股份有限公司 | A kind of enamel steel plate and its manufacturing method with excellent high temperature deformation performance |
| CN107794460B (en) * | 2016-08-30 | 2019-07-23 | 宝山钢铁股份有限公司 | A kind of enamel high-strength steel sheet and its manufacturing method with excellent two-sided application of slip performance |
| CN107574375A (en) * | 2017-08-31 | 2018-01-12 | 武汉钢铁有限公司 | Counterenamel hot rolling acid-cleaning steel plate and its manufacture method with excellent application of slip performance |
| CN107574375B (en) * | 2017-08-31 | 2019-06-07 | 武汉钢铁有限公司 | Counterenamel hot rolling acid-cleaning steel plate and its manufacturing method with excellent application of slip performance |
| WO2019076717A1 (en) * | 2017-10-16 | 2019-04-25 | Thyssenkrupp Steel Europe Ag | Enamelling of high-strength steels |
| CN113025907A (en) * | 2021-03-09 | 2021-06-25 | 马鞍山钢铁股份有限公司 | Cold-rolled enameled steel plate for anti-pressing and anti-explosion porcelain water heater liner and production method thereof |
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| CN101586210B (en) | 2011-07-20 |
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